PHP内置函数实现简单洗牌

 function wash_card($num_card)
 {
   $a = array_keys(array_fill(0, $num_card, ''));
   $b = array_keys(array_fill(1, $num_card, ''));
   $card_data = array_combine($a, $b);
   shuffle($card_data);
   return $card_data;
 }

 function card_wash($card_num)
 {
   $card_data = range(1, $card_num);
   shuffle($card_data);
   return $card_data;
 }